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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Geek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North,Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)791-0342 <br /> .Gettler Ryan/Geostrategies Client Project ID Unocal SS#5417, 180179 85 <br /> ',6747 Sierra Court, Ste J Matrix Liquid <br /> -Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9811A00 01-04 Reported Dec 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch# GC120298802005A GC120298802005A GC120298802005A GC120298802005A GC120298802005A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C Westwater C Westwater C Westwater C Westwater C Westwater <br /> IVIS/MSD# 8120024 8120024 8120024 8120024 8120024 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 112/2/98 12/2/98 12/2/98 12/2/98 12/2/98 <br /> Analyzed Date 12/2/98 12/2/98 12/2/98 12/2/98 12/2/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20pg/L 20ug/L 20ug/L 60p9/L 290lrg/L <br /> Result 22 23 22 69 280 <br /> MS % Recovery 110 115 110 115 97 <br /> Dup Result 21 21 21 64 300 <br /> MSD % Recov.` 105 105 105 107 103 <br /> RPD 47 91 47 75 69 <br /> RPD Limit- 0-20 0-20 0-20 0-20 0-50 <br /> LCS #. LCS120298 LCS120298 LCS120298 LCS120298 LCS120298 <br /> Prepared Date 12/2/98 12/2/98 12/2/98 12/2/98 12/2/98 <br /> Analyzed Date- 12/2/98 12/2/98 12/2/98 12/2/98 12/2/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L 290 ug/L <br /> LCS Result 211 21 21 fib 300 <br /> LCS % Recov 105 105 105 110 103 <br /> LCS 70.130 70-130 70-130 70-130 60-1140 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matnx spike is an aliquot of sample <br />. ELAP#127 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> cher <br /> /' O t Manager **MS-Matrix Spike, MSD=MS Duplicate,RPD-Relative%Difference 981 iA00 GEE -41> <br />